As much as from this training cup has never tasted my son. Glad I bought this product because before my little one (7 months old) has drunk nothing but milk and even from the normal milk bottle teat. Now he drinks sometimes the whole cup empty although only water is in it. Another positive aspect is that my son can hold this cup unaided now and independently drink it. This product is also very stable, has already survived many falls and there is still everything sealing.